Select a <body> Tag Event

After the Drag Layer behavior works the way you want it to you need to add an event to trigger the Drag Layer action. If you apply the behavior to the <body> tag it may have defaulted to the onLoad event. If the onLoad event is not already selected, select it from the Event pop-up menu.

You can trigger the Drag Layer behavior from other object's event too. For instance, you may require the user to click on something to show the layer that they will drag. You could place the Drag Layer behavior under the Show-Hide Layer behavior so that once the layer is visible it is also draggable.